When you mentioned ... " just a light jog ... etc..", that can have a meaning that can be interpreted in many ways.
In the coaching circles of athletics, there is a method of preparing athletes called . Sometimes, this can be misinterpreted as just a "jog" to those that are not familiar with the system(s). Not that I'm implying what you witnessed is any less in your eyes as "just a jog."
During the end of my career as a pitching coach, I attended a preview of this kind of "prep", and to many in attendance, it was a departure from what I had been accustomed to. In fact many who attended, like myself, were well into our late 50's, and thought ... gimmick, gimmick, gimmick. But not any more. Going one step further, any pitching coach who really wants to see who's prepared for a days pay and who's not, let the dynamic stretching routines do it's thing and watch who starts to slack off - bingo .. that individual is a prime candidate for an injury(s), or has issues worth addressing on the spot.